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How much does a shadow weigh ?


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#1    Saru

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Posted 05 February 2014 - 10:40 AM

How much does a shadow weigh ?
Posted Image
Click here to watch video - 07:40s

Michael attempts to determine whether or not it is possible to actually weigh a shadow.




#2    Eldorado

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Posted 05 February 2014 - 11:18 AM

Get Hank Marvin in and just stand him on some scales!   (lol.... sorry)


#3    Taun

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Posted 05 February 2014 - 11:31 AM

I didn't watch the embedded video (no sound here at work) but it might be possible if you could "weigh" the photons (if that's the right word) that hit the lit areas and compare to the impacts in the shaded
areas... the difference would be the "weight" of the shadow...

(Unless I'm wrong of course. In which case - never mind)


#4    Frank Merton

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Posted 05 February 2014 - 11:47 AM

View PostTaun, on 05 February 2014 - 11:31 AM, said:

I didn't watch the embedded video (no sound here at work) but it might be possible if you could "weigh" the photons (if that's the right word) that hit the lit areas and compare to the impacts in the shaded
areas... the difference would be the "weight" of the shadow...

(Unless I'm wrong of course. In which case - never mind)
In that case I would think you'd get a negative number.


#5    029b10

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Posted 05 February 2014 - 11:51 AM

View PostTaun, on 05 February 2014 - 11:31 AM, said:

I didn't watch the embedded video (no sound here at work) but it might be possible if you could "weigh" the photons (if that's the right word) that hit the lit areas and compare to the impacts in the shaded
areas... the difference would be the "weight" of the shadow...

(Unless I'm wrong of course. In which case - never mind)

Brilliant deduction, Watson

I agree with you, shawdows which are formed by the absence of visible light which is massless, you can't be wrong because if light had mass how could it pass through a window since no two bodies of mass can possess the same body of space at the same time, and seeing  that they are  in themselves a massless form of visible light which become visible from the absence of mass and energy.  Therefore, massless being the absence of mass, shadows therefore have no weight.  I don't know how you figured all that out but your absolutely brilliant.

Like Aloe says, your the man!

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#6    Taun

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Posted 05 February 2014 - 11:52 AM

View PostFrank Merton, on 05 February 2014 - 11:47 AM, said:

In that case I would think you'd get a negative number.

Sure... just disregard the negative sign....  3 from 2 is -1 ... 2 from 3 is 1....  same difference...


#7    lightly

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Posted 05 February 2014 - 11:55 AM

hmmm  ...  in that case .. do we weigh less in the dark?!  (lol)   250px-Radiometer_9965_Nevit.gif

Edited by lightly, 05 February 2014 - 12:07 PM.

Important:  The above may contain errors, inaccuracies, omissions, and other limitations.

#8    Taun

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Posted 05 February 2014 - 12:37 PM

Let me rephrase what I wrote earlier...  The difference would not be the "weight" of the shadow... The 'weight' would be the actual value of the photons hitting the shaded area (from other light
sources or reflections, etc - because a 0 count would be absolute darkness )...  The difference would simply indicate how much the primary light source was putting out...

And while Photon's do not have a mass (for practical purposes), they may be able to be measured (counted) when they strike an object...


#9    MissJatti

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Posted 05 February 2014 - 12:45 PM

after all that.. the weigh of michael's arm/hand shadow, weigh roughly the same as michael's brain

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#10    Frank Merton

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Posted 05 February 2014 - 01:03 PM

Photons do exert a force and that force can be measured in small fractions of a gram.  That is at least how I think certain theoretical spacecraft would travel between stars.


#11    toast

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Posted 05 February 2014 - 01:24 PM

A shadow cannot be weighted as it is not a physical body that is subject to the effects of gravitation/acceleration (+ or -).
The word shadow is just a description for an area that absorbs less photons than the area around it during observation. :yes:

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#12    Taun

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Posted 05 February 2014 - 02:33 PM

View Posttoast, on 05 February 2014 - 01:24 PM, said:

A shadow cannot be weighted as it is not a physical body that is subject to the effects of gravitation/acceleration (+ or -).
The word shadow is just a description for an area that absorbs less photons than the area around it during observation. :yes:

True... but you can quantify the amount of photons that strike an area and from that determine the "shadowiness" of an area... hence the "weight"... Sort of a "grey scale of shadows"...


#13    questionmark

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Posted 05 February 2014 - 03:10 PM

if a shadow has any influence on a scale at all it would be a negative one because less photons hit it. So, the right question would not be: "how much does a shadow weigh?" but "how much does light weigh?".

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#14    029b10

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Posted 05 February 2014 - 03:24 PM

The correct would still be nothing, cause Light ain't heavy, that's my brother!

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#15    questionmark

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Posted 05 February 2014 - 03:59 PM

View Post029b10, on 05 February 2014 - 03:24 PM, said:

The correct would still be nothing, cause Light ain't heavy, that's my brother!

We don't know that, so far we only know is that a photon ( the main component of light) is smaller than 1×10−18 eV/c2. That is about the smallest measurement we can make.

But given that gravitation affects light it must have a mass.

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The most dangerous views of the world are from those who have never seen it. ~ Alexander v. Humboldt
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